Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Create/RingtoetsPipingSurfaceLineCreateExtensions.cs
===================================================================
diff -u -rae6f0c6b534ca650e160ae6d9c0bc90369d25c68 -r6a9a423fddb189769e43cc9d69d4dd828a6f68e2
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Create/RingtoetsPipingSurfaceLineCreateExtensions.cs	(.../RingtoetsPipingSurfaceLineCreateExtensions.cs)	(revision ae6f0c6b534ca650e160ae6d9c0bc90369d25c68)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Create/RingtoetsPipingSurfaceLineCreateExtensions.cs	(.../RingtoetsPipingSurfaceLineCreateExtensions.cs)	(revision 6a9a423fddb189769e43cc9d69d4dd828a6f68e2)
@@ -48,6 +48,10 @@
             {
                 throw new ArgumentNullException("registry");
             }
+            if (registry.Contains(surfaceLine))
+            {
+                return registry.Get(surfaceLine);
+            }
 
             var entity = new SurfaceLineEntity
             {